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Guang Ri Dong,Qing Ri Li,우설희,정영훈,김인수 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.11
This paper reports a novel synthetic method for the preparation of various urethanes and the application to the synthesis of carisbamate. The reaction of primary (2a, 2e and 2f) or secondary (2g-2i) trimethylsilyl ethers with chlorosulfonyl isocyanate afforded the corresponding urethanes in good yields without affecting the olefin moiety. However, in the case of secondary benzylic trimethylsilyl ether 2j, the corresponding urethane 3j was obtained in low yield. From the difference in reactivity between the primary and secondary benzylic trimethylsilyl ethers, the one-pot synthesis of carisbamate 1 from bis-trimethylsilyl ether 2l was achieved.
Dong, Guang-Ri,Li, Qing-Ri,Woo, Seol-Hee,Kim, In-Su,Jung, Young-Hoon 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.11
This paper reports a novel synthetic method for the preparation of various urethanes and the application to the synthesis of carisbamate. The reaction of primary (2a, 2e and 2f) or secondary (2g-2i) trimethylsilyl ethers with chlorosulfonyl isocyanate afforded the corresponding urethanes in good yields without affecting the olefin moiety. However, in the case of secondary benzylic trimethylsilyl ether 2j, the corresponding urethane 3j was obtained in low yield. From the difference in reactivity between the primary and secondary benzylic trimethylsilyl ethers, the one-pot synthesis of carisbamate 1 from bis-trimethylsilyl ether 21 was achieved.
병해충 이미지의 데이터 셋과 증강에 대한 최근 동향 조사
이지민,YIN HELIN,Ri Zheng,Dong Jin,구영현,유성준 한국차세대컴퓨팅학회 2022 한국차세대컴퓨팅학회 학술대회 Vol.2022 No.05
병해충으로 인한 피해가 날이 갈수록 커지고 있다. 특히 고위험 문제 병해충의 피해를 최소화하기 위해서는 병해충의 빠른 진단은 필수이다. 최근 인공지능 기술의 발전으로 많은 병해충 진단 연구에서는 딥러닝 기술을 사용하고 있다. 하지만 병해충은 계절성을 띄고 있고 정확한 병해충 이미지를 수집하기 위해서는 전문가의 도움이 필요하기 때문에 정확한 병해충 이미지 수집에 한계가 있다. 부족한 병해충 이미지를 늘리기 위해 본 논문에서는 현재 제공되고 있는 병해충 이미지 데이터 셋과 최신의 데이터 증강(Data Augmentation) 연구를 조사했다.
Virtual Queue Based QoS Layered Vertical Mapping in Wireless Networks
( Shu-guang Fang ),( Ri-zhao Tang ),( Yu-ning Dong ),( Hui Zhang ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.6
Wireless communication is one of most active areas in modern communication researches, QoS (Quality of Service) assurance is very important for wireless communication systems design, especially for applications such as streaming video etc., which requires strict QoS assurance. The modern wireless networks multi-layer protocol stack structure results in QoS metrics layered and acting in cascade and QoS metrics vertical mapping between protocol layers. Based on virtual buffer between protocol layers and queuing technology, a unified layered QoS mapping framework is proposed in this paper, in which we first propose virtual queue concept, give a novelty united neighboring protocol layers QoS metric mapping framework, and analysis method based on dicerete-time Markov chain, and numerical results show that our proposed framework represents a significant improvement over previous model.
Li, Qing Ri,Dong, Guang Ri,Park, Sook Jin,Hong, Yong Rae,Kim, In Su,Jung, Young Hoon WILEY‐VCH Verlag 2013 European journal of organic chemistry Vol.2013 No.20
<P><B>Abstract</B></P><P>A concise asymmetric formal synthesis of (–)‐swainsonine from readily available <SMALL>D</SMALL>‐erythronolactone is described. The key steps include a highly diastereoselective amination of a chiral benzylic ether, which occurs with the retention of stereochemistry using chlorosulfonyl isocyanate, and a palladium‐catalyzed decarboxylative <I>N</I>‐allylation of an allyl carbamate.</P>
실ㆍ내 외 Jet Erosion 시험에 의한 하상/제방 재료 세굴 특성 분석
김규원(Kim, Kyu-Won),김광일(Jin, Guang-Ri),김기영(Kim, Ki-Young),신동훈(Shin, Dong-Hoon) 한국연안방재학회 2014 한국연안방재학회 학술발표대회 논문집 Vol.2014 No.-
4대강 사업 이후 변화된 하천조건(관리수위의 상승, 수문운영에 의한 방류)으로 인하여 4대강 유역 제방 제체의 포화도가 상승하고, 태풍 및 홍수시 보의 수문 방류로 인하여 파랑과, 와류가 발생하여 제방 둔치부, 제체 및 하상부에 침식-세굴현상이 발생할 가능성이 높다고 할 수 있다. 국외의 경우 하천의 파랑, 와류, 유속 증가에 따른 제체 재료의 침식현상에 대하여 많은 연구가 진행되고 있지만 국내의 경우 침식-세굴 현상의 메카니즘 규명 및 이를 평가하고 정량화할 수 있는 실험장비와 그 결과를 설계에 반영하는 사례는 미비한 실정이다. 이 연구에서는 K-water에서 자체적으로 개발한 Jet Erosion 시험 장비를 활용하여 제체 및 하상재료에 대한 현장/실내시험을 실시하여 4대강 유역 제방의 침식-세굴특성을 분석하였다.
Kim, In Su,Li, Qing Ri,Dong, Guang Ri,Kim, Yoo Chang,Hong, Yeon Ju,Lee, Momi,Chi, Ki-Whan,Oh, Joa Sub,Jung, Young Hoon WILEY-VCH Verlag 2010 EUROPEAN JOURNAL OF ORGANIC CHEMISTRY Vol.2010 No.8
<P>The concise synthesis of the lentiginosine analogues pyrrolizidine alkaloid 2 and pyrroloazepine alkaloid 3 has been achieved from inexpensive and readily available D-lyxose. The key steps in the synthesis included regio- and diastereoselective amination, inter- or intramolecular olefin metathesis, and Appel cyclization. The anti-3,4-amino alcohol 6, essential for the preparation of the title compounds 2 and 3, was synthesized by the regio- and diastereoselective amination of anti-3,4-tribenzyl ether 7 using chlorosulfonyl isocyanate. The reaction of 7 with chlorosulfonyl isocyanate in toluene at 0 °C afforded 6 exclusively with a diastereoselectivity of 26:1 in 84 % yield. These results can be explained by the neighboring-group effect, which leads to retention of thestereochemistry.</P> <B>Graphic Abstract</B> <P>The total synthesis of the lentiginosine analogues pyrrolizidine alkaloid 2 and pyrroloazepine alkaloid 3 starting from readily available D-lyxose has been achieved by the regio- and diastereoselective allylic amination of the anti-3,4-tribenzyl ether using chlorosulfonyl isocyanate (CSI), intra- or intermolecular olefin metathesis, andAppel cyclization. <img src='wiley_img_2010/1434193X-2010-2010-8-EJOC200901443-fig000.gif' alt='wiley_img_2010/1434193X-2010-2010-8-EJOC200901443-fig000'> </P>